[pybliographer] Use a Unicode apostrophe in AppData

[Piotr Drąg <piotrdrag src gnome org>]

commit 4f9a5736a9689e92b2fc284590ca6013b689b661
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Mar 29 20:22:30 2018 +0200

    Use a Unicode apostrophe in AppData

 data/pybliographic.appdata.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/pybliographic.appdata.xml.in b/data/pybliographic.appdata.xml.in
index 4e6b764..a220e97 100644
--- a/data/pybliographic.appdata.xml.in
+++ b/data/pybliographic.appdata.xml.in
@@ -9,7 +9,7 @@
  <description>
   <p>
    Pybliographer is a tool for managing bibliographic databases. It can be
-   used for searching, editing, reformatting, etc. In fact, it's a simple
+   used for searching, editing, reformatting, etc. In fact, it’s a simple
    framework that provides easy to use python classes and functions, and
    therefore can be extended to many uses (generating HTML pages according
    to bibliographic searches, etc).